Random videos for backgrounds

I was wondering if there was a way to either1- Have a random video play when there isnt one2- modify the visulization. I dont really like the defaults for it.

What i've been doing is finding lyric videos, But I was wondering if there was just a way for songs without videos to just play a random (or stock) video. I'm hoping to sorta 'link' them so I dont have to go out and create a new video for each.

The video must be in the folder where lies the .txt file.If you have music without video, then add one.(Don't forget to add in the .txt file the line : #VIDEO:name_of_the_video.format_video (mp4, mpeg, avi)There must not be a lot of songs without video I think.

When I've got not video for the song I create, then I try to create one myself, or look for a live video.Or I put a simple background (the album cover) in place of the video.